Pay-per-call premium API access on Base via x402 protocol at $0.02/request in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. It accepts POST requests and requires a per-call payment of 20,000 base units of USDC (USD Coin, 6 decimals) on the Base network, which equates to $0.02 per request. The endpoint is live and returns a standard 402 challenge when called without payment.
The broader lowpaymentfee.com platform advertises multiple API categories including Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02/request price point. The platform emphasizes no API keys, no rate limits, instant access, and settlement on the Base network.
This specific endpoint (/api/v1/transfers/166) is labeled "Premium API Access" but its exact functionality is not documented beyond that label. There is no OpenAPI schema, no detailed documentation, and no example request/response bodies available from the crawled pages. The docs, API, pricing, and README pages all only show a "Connect wallet" prompt with no additional content.
Capabilities
Use cases
- —Accessing premium API services without traditional API key registration
- —Making one-off API calls with instant USDC micropayments on Base
- —Integrating pay-per-use endpoints into autonomous agent workflows
Fit
Best for
- —Developers who want keyless, pay-as-you-go API access
- —AI agents that can settle payments via x402 protocol on Base
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users who need detailed API documentation or guaranteed SLAs
- —Applications requiring free or subscription-based access without per-call costs
- —Developers not set up for USDC payments on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transfers/166 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no example requests or responses, and the exact functionality behind 'Premium API Access' at /api/v1/transfers/166 is undefined. The docs pages are empty beyond a wallet connect prompt.
Warnings
- —No documentation available — docs, API, pricing, and README pages only show 'Connect wallet'
- —Exact functionality of /api/v1/transfers/166 is unclear; 'Premium API Access' is not descriptive
- —No OpenAPI schema or example payloads available
- —No information on what data is returned after successful payment
Citations
- —Endpoint returns 402 with x402 challenge requiring 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/transfers/166
- —Platform lists APIs at $0.02/request with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/transfers/166